Local control for burst mode optical transmitters
AssigneeMaxim Integrated Products, Inc.
InventorsGarry N. Link, Christopher G. Martinez
Life of this patent
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Abstract
The present invention is a method and apparatus for controlling a drive current of an optical transmitter having a laser. A sensing circuit generates a sensing signal responsive to an intensity of an optical radiation emitted by the laser. An error circuit is coupled to the sensing circuit to generate an error quantity in response to the sensing signal. An updating circuit is coupled to the error circuit to update a control quantity based on the error quantity synchronously with an input signal. The control quantity controls the drive current.
Claims24
A method for controlling a drive current of an optical transmitter having a laser, the method comprising:
- generating a sensing signal responsive to an intensity of an optical radiation emitted by the laser using bias and modulating reference currents, the modulating reference current being generated synchronously with an input signal;
- generating an error quantity in response to the sensing signal;
- and
- updating bias and modulating control quantities based on the error quantity synchronously with the input signal, the control quantity controlling the drive current.
An apparatus for controlling a drive current of an optical transmitter having a laser, the apparatus comprising:
- a sensing circuit to generate a sensing signal responsive to an intensity of an optical radiation emitted by the laser using bias and modulating reference currents, the modulating reference current being generated synchronously with an input signal;
- an error circuit coupled to the sensing circuit to generate an error quantity in response to the sensing signal;
- and
- an updating circuit coupled to the error circuit to update bias and modulating control quantities based on the error quantity synchronously with the input signal, the control quantity controlling the drive current.
Dependencies are inferred from the claim text.